JavaScript LinkedIn Quiz: Test Your Skills!
-
What is the correct syntax to create a function in JavaScript?
-
Function myFunction(){}
-
Function: myFunction(){}
-
Func myFunction(){}
-
Create function myFunction(){}
-
Prepare yourself for the JavaScript LinkedIn quiz with our comprehensive practice test! If you're a beginner or looking to refine your skills, this quiz is designed to help you succeed in the LinkedIn JavaScript assessments. It covers a wide range of topics, including basic syntax, functions, arrays, objects, and more, allowing you to test and strengthen your understanding of JavaScript.
By taking this quiz, you’ll gain valuable insights into the types of questions you may face during the actual assessment and improve your problem-solving abilities. With a focus on practical application and real-world scenarios, this quiz ensures you're not only ready for the test but confident in your ability to tackle JavaScript challenges. Take the JavaScript LinkedIn quiz today and boost your chances of acing the LinkedIn assessment, advancing your career, and enhancing your profile with proven JavaScript skills.
.webp "JavaScript LinkedIn Quiz: Test Your Skills! - Quiz")
Quiz Preview
- 2.
How do you add a comment in JavaScript?
-
// comment
-
<!-- comment -->
-
# comment
-
/* comment */
Correct Answer
A. // commentExplanation
In JavaScript, single-line comments are created using // followed by the comment text. For multi-line comments, /* comment */ is used. Comments are essential for making your code more readable and for explaining sections of code, especially when working on larger projects with multiple contributors.Rate this question:
-
- 3.
What does the console.log() function do in JavaScript?
-
Logs errors to the console
-
Displays output in the console
-
Creates a new JavaScript file
-
Stops the JavaScript program
Correct Answer
A. Displays output in the consoleExplanation
console.log() is used to display output or messages in the JavaScript console, which is useful for debugging or tracking values during code execution. It helps developers understand what is happening inside their code at specific points by printing variable values, error messages, or other relevant information.Rate this question:
-
- 4.
Which of the following is the correct way to declare a variable in JavaScript?
-
Var myVar;
-
Dim myVar;
-
Declare myVar;
-
Let myVar = 0;
Correct Answer
A. Var myVar;Explanation
In JavaScript, variables can be declared using var, let, or const, with let and const being used for block-scoped variables. var is function-scoped and can lead to issues when used improperly. let and const provide more control, with let allowing reassignment and const making the variable immutable after initialization.Rate this question:
-
- 5.
How do you check the type of a variable in JavaScript?
-
Typeof(variable)
-
Checktype(variable)
-
Typeof variable()
-
TypeOf(variable)
Correct Answer
A. Typeof(variable)Explanation
The typeof operator in JavaScript is used to check and return the type of a given variable, such as "string," "number," or "object." This helps to ensure the correct data type is being used, which is especially important in dynamic languages like JavaScript where types can be changed during runtime.Rate this question:
-
- 6.
What is the result of 2 + '2' in JavaScript?
-
22
-
4
-
Error
-
NaN
Correct Answer
A. 22Explanation
In JavaScript, the + operator can be used for both addition and string concatenation. So, 2 + '2' results in the string "22" instead of numeric addition. JavaScript treats the + operator as a way to concatenate strings if one of the operands is a string, which is a common source of confusion for beginners.Rate this question:
-
- 7.
What is the purpose of the return statement in JavaScript functions?
-
It stops the function execution
-
It outputs data to the console
-
It sends data from the function back to the caller
-
It defines the function parameters
Correct Answer
A. It sends data from the function back to the callerExplanation
The return statement is used to send a value from a function back to the caller. It effectively ends the function execution and passes data. By using return, you can retrieve the output of a function and use it in other parts of your program, making your functions more useful and reusable.Rate this question:
-
- 8.
Which of the following is a correct way to define an object in JavaScript?
-
Var person = {name: 'John', age: 30};
-
Var person = ('name': 'John', 'age': 30);
-
Object person = {name: 'John'};
-
Var person = [name = 'John', age = 30];
Correct Answer
A. Var person = {name: 'John', age: 30};Explanation
Objects in JavaScript are defined using curly braces {} with key-value pairs, where the key is a string and the value is any data type. Objects are one of the most powerful features of JavaScript, allowing you to store and organize complex data in a way that is easy to access and modify.Rate this question:
-
- 9.
What does the === operator do in JavaScript?
-
Compares values only
-
Compares values and type
-
Checks for equality with a condition
-
Assigns a value to a variable
Correct Answer
A. Compares values and typeExplanation
The === operator checks both the value and type for equality, unlike ==, which only compares the value. It ensures strict comparison, meaning that it will only return true if both the value and type are exactly the same, reducing errors that can arise from type coercion.Rate this question:
-
- 10.
How do you create an array in JavaScript?
-
Var myArray = [];
-
Var myArray = ();
-
Var myArray = {};
-
Var myArray = new Array[];
Correct Answer
A. Var myArray = [];Explanation
Arrays in JavaScript are created using square brackets []. Elements can be added to the array separated by commas. Arrays are used to store multiple values in a single variable and can store any data type, including other arrays or objects, making them versatile for various programming tasks.Rate this question:
-
- 11.
What does the push() method do in a JavaScript array?
-
Adds an element to the beginning of the array
-
Adds an element to the end of the array
-
Removes the last element of the array
-
Removes the first element of the array
Correct Answer
A. Adds an element to the end of the arrayExplanation
The push() method in JavaScript adds a new element to the end of an array, and it returns the new length of the array after the element is added. This method is commonly used when you need to dynamically add items to an array during the execution of your program.Rate this question:
-
- 12.
How can you check if an array contains a specific value in JavaScript?
-
Array.contains(value)
-
Array.includes(value)
-
Array.has(value)
-
Array.exists(value)
Correct Answer
A. Array.includes(value)Explanation
The includes() method in JavaScript checks if an array contains a specified value and returns true or false based on the presence of the value. This method is useful when you want to check for the existence of a value in an array before performing an action, like filtering or processing data.Rate this question:
-
- 13.
What is a for loop used for in JavaScript?
-
To define a function
-
To create a conditional block
-
To execute code repeatedly
-
To declare a variable
Correct Answer
A. To execute code repeatedlyExplanation
The for loop is used to execute a block of code a specific number of times. It’s commonly used to iterate through arrays or collections. The for loop has a built-in counter, making it efficient for repeating tasks, and it can also be customized with a specific range or condition.Rate this question:
-
- 14.
What is the default value of a variable declared without initialization in JavaScript?
-
Undefined
-
Null
-
0
-
NaN
Correct Answer
A. UndefinedExplanation
In JavaScript, a variable declared without an initial value is automatically assigned the value undefined. It indicates the variable has been declared but not initialized. This is important to understand because it helps identify bugs in your code when variables are referenced before they are given a value.Rate this question:
-
Quiz Review Timeline (Updated): Jun 8, 2025 +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Jun 08, 2025Quiz Edited by
ProProfs Editorial Team -
May 27, 2025Quiz Created by
Kasturi Chaudhuri
Back to top